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  4. A 2 ohm and a (.2/3.) ohm resistor are connected in parallel across a 3 volt battery. Then energy given out per minute is :-

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Q. A $2$ ohm and a $\left(\right.2/3\left.\right)$ ohm resistor are connected in parallel across a $3$ volt battery. Then energy given out per minute is :-

NTA AbhyasNTA Abhyas 2020

Solution:

Net resistance is $R=\frac{2 \times 2 / 3}{2 + 2 / 3}=0.5\Omega$
The energy given out per minute is
$E=\frac{V^{2}}{R}t=\frac{3^{2}}{0 . 5}\times 60=1080J$